range(SVC, :gamma, ...) returns NominalRange instead of NumericRange

[oleskiewicz]

Describe the bug

using MLJ
@load SVC
svc = SVC()
gamma_range = range(svc, :gamma, lower=0.5, upper=1.5, scale=:linear)

Expected behavior
A NumericRange should be returned.

Additional context

using MLJ
@load SVC
svc = SVC()
gamma_range = range(svc, :gamma, values=[0.5, 1.0, 1.5])

This works, because Base.range in src/parameters.jl implementation returns NominalRange.

Versions

Juliav1.1, MLJ.jl#master (5a18eee)

[oleskiewicz]

Fixed by #171, with a caveat that svc needs to be initialised with a numerical, not automatic :gamma:

using MLJ; @load SVC;
svc = SVC(gamma=0.5)
gamma_range = range(svc, :gamma, lower=0.5, upper=1.5, scale=:linear)

[ablaom]

I have stopped the offending mutation of model structs in the fit methods of LIBSVM, which should resolve this issue.

@oleskiewicz Would you be so kind as to check this is fixed in your notebook and close this issue if all okay?

[ablaom]

oops, I see I need to merge your PR first. looking at that now